Merge branch 'stable'

src/public/javascripts/services/note_detail_book.js

@@ -270,7 +270,10 @@ class NoteDetailBook {
         return type;
     }
 
-    getContent() {}
+    getContent() {
+        // for auto-book cases when renaming title there should be content
+        return "";
+    }
 
     show() {
         this.$component.show();

src/services/notes.js

@@ -373,6 +373,7 @@ async function updateNote(noteId, noteUpdates) {
     note.isProtected = noteUpdates.isProtected;
     await note.save();
 
+    // this might be simplified to just !== undefined
     if (!['file', 'image', 'render'].includes(note.type)) {
         noteUpdates.content = await saveLinks(note, noteUpdates.content);